From 3afd514bca6ea572e614b5289c4429ace693311b Mon Sep 17 00:00:00 2001 From: Jakub Jelinek Date: Mon, 6 May 2019 23:50:14 +0200 Subject: re PR tree-optimization/88709 (Improve store-merging) PR tree-optimization/88709 PR tree-optimization/90271 * params.def (PARAM_STORE_MERGING_MAX_SIZE): New parameter. * gimple-ssa-store-merging.c (encode_tree_to_bitpos): Handle non-clobber CONSTRUCTORs with no elts. Remove useless tmp_int variable. (imm_store_chain_info::coalesce_immediate_stores): Punt if the size of the store merging group is larger than PARAM_STORE_MERGING_MAX_SIZE parameter. (split_group): Add bzero_first argument. If set, always emit first the first store which must be = {} of the whole area and then for the rest of the stores consider all zero bytes as paddings. (imm_store_chain_info::output_merged_store): Check if first store is = {} of the whole area and if yes, determine which setting of bzero_first for split_group gives smaller number of stores. Adjust split_group callers. (lhs_valid_for_store_merging_p): Allow decls. (rhs_valid_for_store_merging_p): Allow non-clobber CONTRUCTORs with no elts. (pass_store_merging::process_store): Likewise. * gcc.dg/store_merging_26.c: New test. * gcc.dg/store_merging_27.c: New test. * gcc.dg/store_merging_28.c: New test. * gcc.dg/store_merging_29.c: New test. From-SVN: r270924 --- gcc/params.def | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'gcc/params.def') diff --git a/gcc/params.def b/gcc/params.def index 3c9c5fc..904b3cb 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -1205,6 +1205,11 @@ DEFPARAM (PARAM_MAX_STORES_TO_MERGE, "store merging pass.", 64, 2, 0) +DEFPARAM (PARAM_STORE_MERGING_MAX_SIZE, + "store-merging-max-size", + "Maximum size of a single store merging region in bytes.", + 65536, 1, 1) + DEFPARAM (PARAM_MAX_TAIL_MERGE_ITERATIONS, "max-tail-merge-iterations", "Maximum amount of iterations of the pass over a function.", -- cgit v1.1